Best Proxy for LLM-Based Web Scraping Agents: What Actually Matters at Production Scale

LLM-based web scraping agents have different failure modes than traditional scrapers. A traditional scraper fails fast and visibly — you get a 403, you log it, you retry. An LLM agent fails silently: it gets a CAPTCHA page, a bot-detection redirect, or a rate-limited response, and it either halts the pipeline or, worse, passes garbage HTML into the model context and produces confident nonsense. The proxy layer is where most of these failures originate, so choosing it correctly is not a secondary concern.

Here is what actually matters when selecting a proxy for LLM agent workloads, and how to evaluate the tradeoffs honestly.

Residential over datacenter for agent workloads

Datacenter IPs are fast and cheap per GB, but they are trivially fingerprinted by most modern bot-detection stacks. For static content pipelines where you control the target list and the targets are lenient, datacenter proxies are fine. For LLM agents that need to browse dynamically — following links, reading paginated results, resolving redirects — datacenter IPs get blocked at a rate that compounds unpredictably across a long agent run. A single blocked hop mid-session can corrupt the entire reasoning chain. Residential IPs, sourced from real devices on real ISPs, survive this far better because they carry authentic ASN and device fingerprints that detection systems are tuned to pass.

Rotating vs. sticky sessions — know which your agent needs

Most residential proxy providers give you two modes: rotating (fresh IP per request) and sticky (same IP held for a window, typically 1 to 30 minutes). The choice matters for agents specifically because many LLM agent patterns involve multi-step sessions — login, navigate, extract, paginate — where IP rotation mid-session will trigger re-authentication or session invalidation. For those flows, you need sticky sessions long enough to complete the task. For single-page extraction tasks where the agent fires one request and moves on, rotating per-request is cleaner because it minimizes the exposure of any single IP.

A good infrastructure provider gives you both and lets the agent control which mode is active at the request level, rather than forcing a